Sonic soot blowers offer a cost-effective and non-destructive means of preventing ash and particulate build-up within the power generation industry. They use high energy – low frequency sound waves that provide 360° particulate de-bonding and at a speed in excess of 344 metres per second. Because they employ non-destructive sound waves, unlike steam soot blowers they eliminate any concerns over corrosion, erosion or mechanical damage and do not produce an effluent stream.
en.wikipedia.org/wiki/Sonic_soot_blowers